Vendor Review
PureRx Peptides Review: A First-Hand Look at Their Tirzepatide CoA
Research use / not medical advice
This article is for research purposes only. All compounds discussed are intended for laboratory research use by licensed researchers — not for human consumption. Nothing here is medical advice. This page contains affiliate links; see our affiliate disclosure.
Overview
Most peptide vendor reviews are written from the outside — pulling community feedback, checking websites, evaluating documentation at a distance. This one is different.
We purchased Tirzepatide 30mg directly from PureRx Peptides, received a Certificate of Analysis from Accumark Labs, and verified it ourselves. What follows is what we found.
Bottom line
PureRx passes the documentation test with a clean, third-party-verified CoA — 99.84% HPLC purity, single-peak chromatogram, QR-verified. The one gap is mass spectrometry. For researchers sourcing GLP-1 analogs who don't require MS confirmation, they're worth evaluating.
Who is PureRx Peptides?
PureRx Peptides (purerxpeptides.com) is a US-based research peptide supplier operating out of Johnston, Iowa. Their catalog covers the compounds most actively researched in the peptide community, with particular depth in GLP-1 analogs — Tirzepatide, Semaglutide, and Retatrutide.
Their CoA documentation is handled through Accumark Labs, a third-party analytical laboratory. Every product page links to batch-specific testing.
The CoA: what we actually received
Here's what the Accumark Labs CoA for Tirzepatide 30mg showed:
- Lab: Accumark Labs (third-party, independent)
- Sample: TIRZ30mg, Lot SML-RIT-30-YRG-2603
- Received: 04/20/2026 · Published: 04/22/2026
- Declared identity: Tirzepatide
| Test | Specification | Result | Status |
|---|---|---|---|
| Identity | Tirzepatide | Tirzepatide | CONFORMS |
| Quantity | Measure | 35.84 mg | MEASURED |
| Purity (HPLC) | >98.0% | 99.84% | CONFORMS |
HPLC chromatogram: single clean peak at 7.086 minutes. No secondary peaks, no visible contaminants — exactly what a clean peptide chromatogram should look like.
Signed by: Anthony Burke PhD (Lab Manager) and Dr. Levi Fried MD (Lab Director), 04/22/2026.
Verification: the CoA includes a QR code linking directly to the document on accumarklabs.com. We scanned it — it resolves to the actual certificate.
CoA breakdown: what it means
For researchers new to CoA verification, here's what each element tells you:
99.84% HPLC purity. Excellent. The research standard is ≥98%. This result is near the top of what you'll see from any vendor in this category — roughly 99.84% of the measured compound is the declared substance.
Single HPLC peak. The chromatogram shows one dominant peak at 7.086 minutes with no significant secondary peaks. Secondary peaks would indicate impurities or degradation products. A clean single peak is the best possible result.
Third-party lab. Accumark Labs is independent. In-house testing carries an obvious conflict of interest; third-party testing means a separate organization with no financial stake ran the analysis.
Batch-specific lot code. The CoA references lot SML-RIT-30-YRG-2603 — the testing corresponds to the specific batch, not a generic certificate applied across all inventory.
What's missing: mass spectrometry. A complete CoA would also include MS data showing the observed molecular ion matches Tirzepatide's theoretical molecular weight. PureRx's CoA covers HPLC purity and identity but not MS. This is common among mid-tier vendors — not a red flag, but researchers who require MS confirmation should note it.
Catalog
PureRx's catalog is strong on GLP-1 compounds — the highest-demand category in current research peptide sourcing.
GLP-1 / metabolic research: Tirzepatide (5mg, 10mg, 15mg, 30mg), Semaglutide, Retatrutide.
Healing & recovery: BPC-157, TB-500, and GHK-Cu. Worth noting separately: their GHK-Cu is priced at $18, the lowest we've seen across any vendor we've evaluated. GHK-Cu is a copper peptide researched for wound healing, anti-aging, and collagen synthesis — at this price point it's a standout value.
Growth hormone axis: Ipamorelin, CJC-1295, Sermorelin.
Cognitive / longevity: Epithalon, Semax.
Pricing and value
PureRx's Tirzepatide 30mg is competitively priced in the mid-tier range. For researchers comparing cost per mg across vendors, their GLP-1 pricing is among the more accessible in the space without appearing to cut corners on documentation.
How PureRx compares
| Factor | PureRx Peptides | Tier-1 vendors |
|---|---|---|
| CoA type | Third-party (Accumark Labs) | Third-party |
| HPLC purity (verified) | 99.84% | >98% typical |
| Mass spectrometry | Not included | Included (top vendors) |
| GLP-1 catalog depth | Strong | Varies |
| Batch-specific documentation | Yes | Yes |
| Community track record | Growing | Established |
Who should consider PureRx?
Good fit for: researchers focused on GLP-1 compound sourcing (their catalog here is deep); those who want third-party HPLC documentation without tier-1 pricing; researchers who verify CoAs and have confirmed Accumark Labs is a real, functional third-party lab.
Consider alternatives if: mass spectrometry confirmation is required for your protocol, or you exclusively source from vendors with 5+ years of documented community validation.
Frequently asked questions
Is PureRx Peptides legit?
Based on our direct purchase and CoA verification: yes, they pass the documentation test. The Accumark Labs CoA for their Tirzepatide showed 99.84% HPLC purity from a real, verifiable third-party lab, and the QR code resolves to the actual certificate.
Does PureRx include mass spectrometry data?
Not on the CoA we received. Their testing covers HPLC purity and identity confirmation. Researchers requiring MS data should contact them directly or consider vendors who include it as standard.
What is Accumark Labs?
Accumark Labs is a third-party analytical laboratory that provides CoA testing for research chemical vendors. Their certificates include HPLC purity analysis, identity confirmation, and chromatogram reports. They are independent from PureRx.
How do I verify my CoA is real?
Scan the QR code on the CoA — it should resolve to the certificate on the lab's website. You can also contact the lab directly to confirm the lot number and results. Never rely on a PDF alone without verifying the source.
Bottom line
PureRx delivers on documentation: 99.84% HPLC purity, a clean single-peak chromatogram, batch-specific lot tracking, and QR-verified access to the original certificate. The missing piece is mass spectrometry — researchers who need molecular-weight confirmation will want to source that elsewhere. But for HPLC-verified purity from a third-party lab, PureRx holds up.